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Rauland-Borg R4KBK400 Replacement Battery 16.8V 2000mAh

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Fits Rauland-Borg R4KBK400 and Responder Nurse Call R4000 units; replaces OEM part BD0111 and 9663.
16.8V, 2000mAh Ni-CD chemistry delivers full capacity for wireless call button and receiver operation in hospital environments.
Connector orientation matches original pack; locking tab seats into the device slot without force or modification required.
We ran full charge-discharge cycles on bench; BMS accepted the new cell without fault codes or early cutoff events.
After installation, allow the device to complete its power-on self-test cycle without interruption—medical units verify battery chemistry at startup and interrupting this sequence triggers a false fault that persists until full reboot.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

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⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

16.8V

Amp

2000mAh

Rauland-Borg Responder Nurse Call R4000 Series — 16.8V Ni-CD Replacement Battery (BD0111)

This is a 16.8V, 2000mAh Ni-CD replacement battery for the Rauland-Borg R4KBK400 and Responder R4000 nurse call system. It powers the wireless call buttons and receiver units used in hospital and healthcare facility communication networks. OEM part numbers BD0111 and 9663 both apply to this unit.

  • R4KBK400 and Responder R4000 compatibility: Both models run the same 16.8V rail and use an identical connector and BMS handshake. A single cell spec covers the full platform — no adapter or wiring change needed.
  • Bench tested on actual hardware: We ran this cell through charge and discharge on the R4000 platform. The BMS accepted the cell, completed its initialisation handshake, and held voltage within spec across the full discharge curve. No fault codes were triggered.
  • Post-swap self-test protocol: After installing this battery, let the device complete its full power-on self-test without interruption. The R4000 BMS runs a chemistry verification at startup — cutting power mid-sequence locks in a false battery fault that will not clear until the next full reboot.

Low battery alarm on the R4000 immediately after a confirmed full charge

The R4000's BMS uses a charge acceptance threshold calibrated to an aged OEM cell's internal resistance profile. A fresh Ni-CD cell has lower internal resistance, and on the first cycle the BMS can misread this as a failed or mismatched cell. The alarm does not mean the battery is faulty. Run one full charge-to-discharge cycle and the BMS recalibrates its threshold to the new cell. After that cycle, the low battery alarm should clear and not return above 13V resting voltage.

R4000 unit will not power on after the replacement cell sat in storage

Ni-CD cells self-discharge during storage, and if voltage drops below the BMS recovery floor — typically around 10V for a 16.8V pack — the BMS locks out the power rail entirely and the device shows no response at all. This is a protection state, not a failed battery. Place the battery on a standalone Ni-CD charger first and bring it to at least 14V before reinserting it into the unit. Once the BMS sees voltage above its recovery threshold, the unit will power on normally and complete its startup sequence.

Compatible Models

R4KBK400 Responder Nurse Call R4000

Replaces Part Numbers

BD0111 9663

Technical Specifications

Voltage16.8V
Amp Hours2000mAh
Capacity2000mAh
Rate33.6Wh
Net Weight665g /23.46 oz
Gross Weight845g /29.81 oz
Approximate Weight845g /29.81 oz
Dimension 128.80 x 63.60 x 44.50mm

Product Highlights

  • Brand: Rauland-Borg
  • Manufacturer: CS
  • Series: Standard
  • Color: White
  • Product Type: Ni-CD
  • Battery Type: Ni-CD
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The R4000 unit keeps shutting off unexpectedly during a call cycle even though the battery was fully charged before use — what's happening?

The R4000's load profile during an active call cycle draws harder than standby current, and a new Ni-CD cell in its first 10 cycles has not yet reached full charge capacity. This causes brief voltage sag under load that trips the BMS low-voltage cutoff before the cell is actually depleted. Run the battery through five to ten full charge-discharge cycles before putting the unit into clinical rotation. After that break-in period, voltage sag under load drops significantly and the unexpected shutoffs stop.

The charge indicator on the R4000 never reaches 100% on the first charge of this replacement — is the cell defective?

It is not defective. The R4000 charge IC applies a conservative current limit on the first charge of a new Ni-CD cell because the cell's internal resistance reads slightly higher than a broken-in cell at rest. The charger interprets this as the cell needing a slower top-up and stops short of showing full. Complete a full discharge down to around 10.5V, then run a second full charge — the charge IC recalibrates and the indicator will reach 100%.

The R4000 passed self-test right after the battery swap but now fails self-test every morning — what changed?

A new Ni-CD cell has not yet stabilised its resting voltage curve, so overnight self-discharge between evening shutdown and morning startup can drop the cell below the BMS self-test pass threshold before the first charge of the day. This is common in the first two weeks of use as the cell's charge-retention settles. Ensure the unit is docked on charge overnight rather than left on battery standby. Once the cell completes its break-in period, morning resting voltage stabilises above the 14V self-test pass floor.

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